Class: Money::Bank::OpenExchangeRatesBank

Inherits:
VariableExchange
  • Object
show all
Defined in:
lib/money/bank/open_exchange_rates_bank.rb

Overview

OpenExchangeRatesBank base class

Constant Summary collapse

VERSION = 
::OpenExchangeRatesBank::VERSION
BASE_URL = 
'https://openexchangerates.org/api/'
OER_URL =

OpenExchangeRates urls

URI.join(BASE_URL, 'latest.json')
OER_HISTORICAL_URL = 
URI.join(BASE_URL, 'historical/')
OE_SOURCE =

Default base currency “base”: “USD”

'USD'
RATES_KEY = 
'rates'
TIMESTAMP_KEY = 
'timestamp'

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#app_id ⇒ String

As of the end of August 2012 all requests to the Open Exchange Rates API must have a valid app_id see docs.openexchangerates.org/docs/authentication

Examples:

oxr.app_id = 'YOUR_APP_APP_ID'

Parameters:

  • token (String) —

    to access OXR API

Returns:

  • (String) —

    token to access OXR API



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 55

def app_id
  @app_id
end

#cache ⇒ String, Proc

Cache accessor

Examples:

oxr.cache = 'path/to/file/cache.json'

Parameters:

  • for (String, Proc) —

    a String a filepath

Returns:

  • (String, Proc) —

    for a String a filepath



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 64

def cache
  @cache
end

#date ⇒ String

Date for historical api see docs.openexchangerates.org/docs/historical-json

Examples:

oxr.date = '2015-01-01'

Parameters:

  • The (String) —

    requested date in YYYY-MM-DD format

Returns:

  • (String) —

    The requested date in YYYY-MM-DD format



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 74

def date
  @date
end

#force_refresh_rate_on_expire ⇒ Object

Force refresh rates cache and store on the fly when ttl is expired This will slow down request on get_rate, so use at your on risk, if you don’t want to setup crontab/worker/scheduler for your application

Parameters:

  • (Boolean) 


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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 81

def force_refresh_rate_on_expire
  @force_refresh_rate_on_expire
end

#json_response ⇒ String (readonly)

Unparsed OpenExchangeRates response as String

Returns:

  • (String) —

    OpenExchangeRates json response



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 96

def json_response
  @json_response
end

#oer_rates ⇒ Hash (readonly)

Parsed OpenExchangeRates result as Hash

Returns:

  • (Hash) —

    All rates as Hash



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 91

def oer_rates
  @oer_rates
end

#prettyprint ⇒ Boolean

Get prettyprint option

Returns:

  • (Boolean) 


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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 250

def prettyprint
  return true unless defined? @prettyprint
  return true if @prettyprint.nil?

  @prettyprint
end

#rates_expiration ⇒ Time (readonly)

Rates expiration Time

Returns:

  • (Time) —

    expiration time



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 86

def rates_expiration
  @rates_expiration
end

#show_alternative ⇒ Boolean

Get show alternative

Returns:

  • (Boolean) —

    if true show alternative



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 243

def show_alternative
  @show_alternative ||= false
end

#symbols ⇒ Array

Get symbols

Returns:

  • (Array) —

    list of symbols to filter by



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 260

def symbols
  @symbols ||= nil
end

#ttl_in_seconds ⇒ Integer

Seconds after than the current rates are automatically expired

Returns:

  • (Integer) —

    Setted time to live in seconds



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 101

def ttl_in_seconds
  @ttl_in_seconds
end

Instance Method Details

#expire_rates ⇒ NilClass, Time

Expire rates when expired

Returns:

  • (NilClass, Time) —

    nil if not expired or new expiration time



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 231

def expire_rates
  return unless ttl_in_seconds
  return if rates_expiration > Time.now

  refresh_rates if force_refresh_rate_on_expire
  update_rates
  refresh_rates_expiration
end

#get_rate(from_currency, to_currency, opts = {}) ⇒ Numeric

Override Money ‘get_rate` method for caching

Parameters:

  • from_currency (String) —

    Currency ISO code. ex. ‘USD’

  • to_currency (String) —

    Currency ISO code. ex. ‘CAD’

Returns:

  • (Numeric) —

    rate.



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 211

def get_rate(from_currency, to_currency, opts = {})
  super if opts[:call_super]
  expire_rates
  rate = get_rate_or_calc_inverse(from_currency, to_currency, opts)
  rate || calc_pair_rate_using_base(from_currency, to_currency, opts)
end

#rates_timestamp ⇒ Time

Current rates timestamp

Returns:

  • (Time) 


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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 140

def rates_timestamp
  @rates_timestamp || Time.now
end

#rates_timestamp=(at) ⇒ Time

Set current rates timestamp

Returns:

  • (Time) 


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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 133

def rates_timestamp=(at)
  @rates_timestamp = Time.at(at)
end

#refresh_rates ⇒ Array Also known as: save_rates

Fetch from url and save cache

Returns:

  • (Array) —

    Array of exchange rates



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 221

def refresh_rates
  read_from_url
end

#source ⇒ String

Get the base currency for all rates. By default, USD is used.

Returns:

  • (String) —

    base currency



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 181

def source
  @source ||= OE_SOURCE
end

#source=(value) ⇒ String

Set the base currency for all rates. By default, USD is used. OpenExchangeRates only allows USD as base currency for the free plan users.

Examples:

oxr.source = 'USD'

Parameters:

  • value (String) —

    Currency code, ISO 3166-1 alpha-3

Returns:

  • (String) —

    chosen base currency



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 169

def source=(value)
  scurrency = Money::Currency.find(value.to_s)
  @source = if scurrency
              scurrency.iso_code
            else
              OE_SOURCE
            end
end

#source_url ⇒ String

Source url of openexchangerates defined with app_id

Returns:

  • (String) —

    URL



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 268

def source_url
  str = "#{oer_url}?app_id=#{app_id}"
  str = "#{str}&base=#{source}" unless source == OE_SOURCE
  str = "#{str}&show_alternative=#{show_alternative}"
  str = "#{str}&prettyprint=#{prettyprint}"
  str = "#{str}&symbols=#{symbols.join(',')}" if symbols&.is_a?(Array)
  str
end

#super_get_rate ⇒ Object

Alias super method



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 203

alias super_get_rate get_rate

#update_rates ⇒ Array

Update all rates from openexchangerates JSON

Returns:

  • (Array) —

    Array of exchange rates



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# File 'lib/money/bank/open_exchange_rates_bank.rb', line 188

def update_rates
  store.transaction do
    clear_rates!
    exchange_rates.each do |exchange_rate|
      rate = exchange_rate.last
      currency = exchange_rate.first
      next unless Money::Currency.find(currency)

      set_rate(source, currency, rate)
      set_rate(currency, source, 1.0 / rate)
    end
  end
end